By Edwin James Houston

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Effective current strength of if it one ampere, produced the same heating coil of effect in a wire as a continuous electric cur- rent of one ampere. This method of estimating the values of alternating E. 's and currents is universally employed, and entirely dispenses with the necessity for a determination of the shapes of the alternating -current any method of measuring tides, which depended upon a measurement of the total quantity of water moved up stream during each tide, would diswaves, just as pense with the necessity for determining the exact shape of the tidal wave.

In New York State, alternating electric currents are the execution of used for criminals, and, when employed, produce absolute, instantaneous, and painless death. properly ^ The experiments of Tesla and others have shown that at frequencies and pressures far higher than those employed for ordinary commercial purposes, the physiological effects of alternating currents be- come less severe, and that at extraordina- 50 ALTEENATING ELECTEIC CUEEENTS. high frequencies, enormous pressures may be handled with impunity.

51 being at certain times at greatest strength and at others entirely absent. It is evi- dent that it would not be correct to estimate the value of an E. M. F. or a current at either its greatest or its least value nor ; is usual to take the average value. F. and the current, called respectively the effective E. M. F. and the effective current strength, s\xe taken as estimated from their equivalent heating effects. Thus, an alternating- current pressure of 100 volts one which, as already mentioned, will produce in an incandescent lamp the same is heating and, 'therefore, the same degree of illumination as 100 volts of continuouscurrent pressure.

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Alternating Electric Currents by Edwin James Houston


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